You think your mother's embarrassing? She's got nothing on Mrs. Bennet. Mrs. Bennet is a small-minded, vulgar woman with no sense of social tact, and she constantly offers up too much information.
Mrs. Bennet is mainly comic relief, and is a pretty savage caricature. She has no self-awareness, she is kind of dumb, she is all surface and no substance, and she is fixated on getting her daughters married without any concern about their future lives. (Elizabeth and Mr. Collins? That would have been a recipe for misery!)
On the other hand, though…well, what else is she supposed to be like?
Think about it. She got married before she was ready to a man who doesn't respect or love her. Now she has to run a fairly complex household despite the fact that she was never the sharpest tool in the shed. She has a totally unhelpful, passive husband, who has failed to put any money aside as savings for his daughters, even though he knows full well that he can't leave the house or estate to them. At the same time, she has five daughters who are too high-status to have jobs but will be too poor to be able to support themselves. Seriously, that's a tough row to hoe, guys. It's no wonder that all she thinks about is when the next eligible bachelor is coming from.